Web Front-endJS TutorialFabricJS - How to create an instance of fabric.Image from its object representation?FabricJS - How to create an instance of fabric.Image from its object representation?
In this tutorial we will show you how to create an instance of Fabric.Image Obtained from its object representation using FabricJS. We can create an Image object by Create an instance of fabric.Image. Since it is one of the basic elements of FabricJS, We can also easily customize it by applying properties such as angle, opacity, etc. To create an instance of fabric.Image from its object representation, we use fromObject method.
grammar
fromObject(object: Object, callback: function)
parameter
object - This parameter accepts an object that represents the object to be obtained from The image will be created.
callback - This parameter is a function that when the image Instance created.
Do not use fromObjectmethod
Example
Let's look at a code example to understand how an Image object appears when fromObject Method is not used. In this case we just need to create an instance of fabric.Image and Add this to our canvas.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2 id="Without-using-the-fromObject-method">Without using the fromObject method</h2>
<p>You can see that the image object has been added to the canvas</p>
<canvas id="canvas"></canvas>
<img src="/static/imghwm/default1.png" data-src="https://www.tutorialspoint.com/images/logo.png" class="lazy" id="img1" style="max-width:90%" / alt="FabricJS - How to create an instance of fabric.Image from its object representation?" >
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating the image element
var imageElement = document.getElementById("img1");
// Initiate an Image object
var image = new fabric.Image(imageElement, {
top: 50,
left: 110,
});
// Add it to the canvas
canvas.add(image);
</script>
</body>
</html>
Use fromObjectmethod
Example
In this example, we use the fromObject method to demonstrate that we can Image objects can be created even if we don't have an image element. In this case we The object from which the image instance needs to be created. after Call the callback function and add it to the canvas.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2 id="Using-the-fromObject-method">Using the fromObject method</h2>
<p>You can see that the image has been added</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Using fromObject method
fabric.Image.fromObject({
type: "image",
version: "5.1.0",
originX: "left",
originY: "top",
left: 110,
src: "https://www.tutorialspoint.com/images/logo.png",
},
function(oImg) {
oImg.set("top", 50);
canvas.add(oImg);
}
);
</script>
</body>
</html>
in conclusion
In this tutorial, we use two examples to demonstrate how to create an instance Get a Fabric.Image from its object representation using FabricJS.
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